- 1(current)
Q. No.A copper wire of radius \(1\) mm contains \(10^{22}\) free electrons per cubic metre. The drift velocity for free electrons when \(10\) A current flows through the wire will be:
(Given, charge on electron = \(1.6\times10^{-19}\) C)
1. \(\frac{6.25\times10^4}{\pi}\) m/s
2. \(\frac{6.25}{\pi}\times10^3\) m/s
3. \(\frac{6.25}{\pi}\) m/s
4. \(\frac{6.25\times10^5}{\pi}\) m/s
(Given, charge on electron = \(1.6\times10^{-19}\) C)
1. \(\frac{6.25\times10^4}{\pi}\) m/s
2. \(\frac{6.25}{\pi}\times10^3\) m/s
3. \(\frac{6.25}{\pi}\) m/s
4. \(\frac{6.25\times10^5}{\pi}\) m/s
Subtopic: Â Current & Current Density |
 72%
From NCERT
NEET - 2023
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A copper wire of length \(10\) m and radius \(\left({10^{-2}/\sqrt{\pi}}\right)\) m has an electrical resistance of \(10~\Omega.\) The current density in the wire for an electric field strength of \(10\) (V/m) is:
1. \(10^{5}\) A/m2
2. \(10^{4}\) A/m2
3. \(10^{6}\) A/m2
4. \(10^{-5}\) A/m2
1. \(10^{5}\) A/m2
2. \(10^{4}\) A/m2
3. \(10^{6}\) A/m2
4. \(10^{-5}\) A/m2
Subtopic: Â Current & Current Density |
 66%
From NCERT
NEET - 2022
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh
Column-I gives certain physical terms associated with flow of current through a metallic conductor.
Column-II gives some mathematical relations involving electrical quantities.
Match Column-I and Column-II with appropriate relations.
| Column-I | Column-II | ||
| (A) | Drift Velocity | (P) | \(\frac{ \mathrm{m}}{\mathrm{ne}^2 \rho}\) |
| (B) | Electrical Resistivity | (Q) | \(nev_d\) |
| (C) | Relaxation Period | (R) | \(\frac{ \mathrm{eE}}{\mathrm{m}} \tau\) |
| (D) | Current Density | (S) | \(\frac{E}{J}\) |
| (A) | (B) | (C) | (D) | |
| 1. | (R) | (P) | (S) | (Q) |
| 2. | (R) | (Q) | (S) | (P) |
| 3. | (R) | (S) | (P) | (Q) |
| 4. | (R) | (S) | (Q) | (P) |
Subtopic: Â Current & Current Density |
 54%
From NCERT
NEET - 2021
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NEET 2023 - Target Batch - Aryan Raj Singh
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A charged particle having drift velocity of \(7.5\times10^{-4}~\text{ms}^{-1}\) in an electric field of \(3\times10^{-10}~\text{Vm}^{-1}\), has mobility of:
1. \(2.5\times 10^{6}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)
2. \(2.5\times 10^{-6}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)
3. \(2.25\times 10^{-15}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)
4. \(2.25\times 10^{15}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)
Subtopic: Â Current & Current Density |
 82%
From NCERT
NEET - 2020
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh
- 1(current)
Q. No.
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